I didn't think either game met the standard of greatness I would have wanted from a top-down Zelda game, but Phantom Hourglass was all right. The sailing portions reminded me a lot of Wind Waker, and I thought the new control scheme was good.
I hated Spirit Tracks with a fiery passion, and I'll tell you why: The overworld is nothing but train ride after train ride, switching tracks to avoid the occasional obstacle (other trains). I felt like more than 50% of the game was just me sitting there watching countryside go by. I forced myself through most of the game -- right up to the very last stretch, in fact. But after seeing what I had to go through to reach the final boss (I won't spoil it here), I shut the game off right there, said "screw it," and packed the cart back into the box. Forever, much like the eternal slumber of the Master Sword in LttP.
Anyway, if you don't care about the ability to wander the overworld freely then the game might be OK for you. But that was 50% of Zelda gone as far as I was concerned.